Well with Australian CMP's the main difference is with the type of sender unit used. Not sure if it is that way Canadian built ones
One type is fixed with 5 screws and the other 6. Also the appearence is different too!
Phil... 
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collection includes:-
Chev "BLITZ's" (CMP's)
Inc:- No.8 FGT, C8A HUW, C15, No.9 GCT (sold)
Milt Land Rovers 
Inc:- 58 "gun buggy", 60 FFW, 70 FFW, 71 10 seater Wgn, 69 GS.
M3 Stuart Light Tank "hybrid" 
FV1600 Humber FFW/cargo
Mk1 Ferret scout car (waiting restoration)
Various trailers
Inc:- K38, "Ben Hur" 1 ton, 200 Gal "Humber" water tank Tlr, Aust jeep, Landrover recovery.
Milt Radios
etc etc... 
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